<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button>fetch</button>
    <script>
      let btn = document.querySelector('button')
      btn.onclick = function () {
        fetch('http://127.0.0.1:8080/fetch?xs=20', {
          // params直接写到路径中
          method: 'post',
          // data: {
          //   username: 'admin',
          //   password: 2000
          // },
          // 请求体：body
          body: 'username=admin&password=2000',
          headers: {
            h: 200,
            w: 300
          },
          dataType: 'json'
        })
          .then((res) => {
            // console.log(res)
            return res.text()
          })
          .then((res) => {
            console.log(JSON.parse(res))
          })
      }
    </script>
  </body>
</html>
